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<h1>eeprom.c</h1><a href="eeprom_8c.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*********************************************************************************</span>
<a name="l00002"></a>00002 <span class="comment"></span>
<a name="l00003"></a>00003 <span class="comment"> Copyright 2006 MakingThings</span>
<a name="l00004"></a>00004 <span class="comment"></span>
<a name="l00005"></a>00005 <span class="comment"> Licensed under the Apache License, </span>
<a name="l00006"></a>00006 <span class="comment"> Version 2.0 (the "License"); you may not use this file except in compliance </span>
<a name="l00007"></a>00007 <span class="comment"> with the License. You may obtain a copy of the License at</span>
<a name="l00008"></a>00008 <span class="comment"></span>
<a name="l00009"></a>00009 <span class="comment"> http://www.apache.org/licenses/LICENSE-2.0 </span>
<a name="l00010"></a>00010 <span class="comment"> </span>
<a name="l00011"></a>00011 <span class="comment"> Unless required by applicable law or agreed to in writing, software distributed</span>
<a name="l00012"></a>00012 <span class="comment"> under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR</span>
<a name="l00013"></a>00013 <span class="comment"> CONDITIONS OF ANY KIND, either express or implied. See the License for</span>
<a name="l00014"></a>00014 <span class="comment"> the specific language governing permissions and limitations under the License.</span>
<a name="l00015"></a>00015 <span class="comment"></span>
<a name="l00016"></a>00016 <span class="comment">*********************************************************************************/</span>
<a name="l00017"></a>00017 <span class="comment"></span>
<a name="l00018"></a>00018 <span class="comment">/** \file eeprom.c  </span>
<a name="l00019"></a>00019 <span class="comment">  EEPROM.</span>
<a name="l00020"></a>00020 <span class="comment">  Functions for working with the EEPROM on the Make Controller Board.</span>
<a name="l00021"></a>00021 <span class="comment">*/</span>
<a name="l00022"></a>00022 
<a name="l00023"></a>00023 <span class="comment">/* Library includes. */</span>
<a name="l00024"></a>00024 <span class="preprocessor">#include &lt;string.h&gt;</span>
<a name="l00025"></a>00025 <span class="preprocessor">#include &lt;stdio.h&gt;</span>
<a name="l00026"></a>00026 
<a name="l00027"></a>00027 <span class="comment">/* Scheduler includes. */</span>
<a name="l00028"></a>00028 <span class="preprocessor">#include "FreeRTOS.h"</span>
<a name="l00029"></a>00029 <span class="preprocessor">#include "task.h"</span>
<a name="l00030"></a>00030 
<a name="l00031"></a>00031 <span class="comment">/* Hardware specific headers. */</span>
<a name="l00032"></a>00032 <span class="preprocessor">#include "Board.h"</span>
<a name="l00033"></a>00033 <span class="preprocessor">#include "AT91SAM7X256.h"</span>
<a name="l00034"></a>00034 
<a name="l00035"></a>00035 <span class="preprocessor">#include "eeprom.h"</span>
<a name="l00036"></a>00036 <span class="preprocessor">#include "spi.h"</span>
<a name="l00037"></a>00037 
<a name="l00038"></a>00038 <span class="preprocessor">#include "config.h"</span>
<a name="l00039"></a>00039 <span class="preprocessor">#include "io.h"</span>
<a name="l00040"></a>00040 
<a name="l00041"></a>00041 <span class="preprocessor">#define EEPROM_INSTRUCTION_WREN 0x06</span>
<a name="l00042"></a>00042 <span class="preprocessor"></span><span class="preprocessor">#define EEPROM_INSTRUCTION_WRDI 0x04</span>
<a name="l00043"></a>00043 <span class="preprocessor"></span><span class="preprocessor">#define EEPROM_INSTRUCTION_RDSR 0x05</span>
<a name="l00044"></a>00044 <span class="preprocessor"></span><span class="preprocessor">#define EEPROM_INSTRUCTION_WRSR 0x01</span>
<a name="l00045"></a>00045 <span class="preprocessor"></span><span class="preprocessor">#define EEPROM_INSTRUCTION_READ 0x03</span>
<a name="l00046"></a>00046 <span class="preprocessor"></span><span class="preprocessor">#define EEPROM_INSTRUCTION_WRITE 0x02</span>
<a name="l00047"></a>00047 <span class="preprocessor"></span>
<a name="l00048"></a>00048 <span class="preprocessor">#define EEPROM_DEVICE 0x03</span>
<a name="l00049"></a>00049 <span class="preprocessor"></span><span class="comment">//#define EEPROM_NOTCS 0x0B  </span>
<a name="l00050"></a>00050 
<a name="l00051"></a>00051 <span class="keyword">static</span> <span class="keywordtype">int</span>  Eeprom_Start( <span class="keywordtype">void</span> );
<a name="l00052"></a>00052 <span class="keyword">static</span> <span class="keywordtype">int</span>  Eeprom_Stop( <span class="keywordtype">void</span> );
<a name="l00053"></a>00053 
<a name="l00054"></a>00054 <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="eeprom_8c.html#3f8f6c2c544d8f2260569ce9b3e88e07" title="Eeprom_WriteEnable.">Eeprom_WriteEnable</a>( <span class="keywordtype">void</span> );
<a name="l00055"></a>00055 <span class="keyword">static</span> <span class="keywordtype">void</span> <a class="code" href="eeprom_8c.html#d636853b4e254c0ca49fe4d6454b01ef" title="Disable writing from the EEPROM on the Make Controller Board.">Eeprom_WriteDisable</a>( <span class="keywordtype">void</span> );
<a name="l00056"></a>00056 
<a name="l00057"></a>00057 <span class="keyword">static</span> <span class="keywordtype">void</span> Eeprom_Ready( <span class="keywordtype">void</span> );
<a name="l00058"></a>00058 
<a name="l00059"></a>00059 <span class="keyword">static</span> <span class="keywordtype">int</span> Eeprom_users;
<a name="l00060"></a>00060 <span class="comment"></span>
<a name="l00061"></a>00061 <span class="comment">/** \defgroup Eeprom</span>
<a name="l00062"></a>00062 <span class="comment">  Eeprom allows for the persistent storage of 32k bytes data. </span>
<a name="l00063"></a>00063 <span class="comment">  The last 1k (1024) bytes of this space are reserved for system</span>
<a name="l00064"></a>00064 <span class="comment">  use storing things like the board's IP address, serial number, build version, etc.  Get the last</span>
<a name="l00065"></a>00065 <span class="comment">  EEPROM address available before this reserved section with a call to Eeprom_GetLastAddress( ).</span>
<a name="l00066"></a>00066 <span class="comment"></span>
<a name="l00067"></a>00067 <span class="comment">  Use Eeprom_Write() and Eeprom_Read() to store and retrieve characters.  These both internally set</span>
<a name="l00068"></a>00068 <span class="comment">  the EEPROM system to active automatically.  </span>
<a name="l00069"></a>00069 <span class="comment"></span>
<a name="l00070"></a>00070 <span class="comment">  Internally, Eeprom relies on \ref Spi, so activating Eeprom also activates \ref Spi.</span>
<a name="l00071"></a>00071 <span class="comment"></span>
<a name="l00072"></a>00072 <span class="comment">  \ingroup Controller</span>
<a name="l00073"></a>00073 <span class="comment">  @{</span>
<a name="l00074"></a>00074 <span class="comment">*/</span>
<a name="l00075"></a>00075 <span class="comment"></span>
<a name="l00076"></a>00076 <span class="comment">/**</span>
<a name="l00077"></a>00077 <span class="comment">  Set the active state of the EEPROM subsystem.  This is automatically set to </span>
<a name="l00078"></a>00078 <span class="comment">  true by any call to Eeprom_Write or Eeprom_Read.</span>
<a name="l00079"></a>00079 <span class="comment">  @param state An integer specifying the active state - 1 (on) or 0 (off).</span>
<a name="l00080"></a>00080 <span class="comment">  @return CONTROLLER_OK (=0) on success.</span>
<a name="l00081"></a>00081 <span class="comment">*/</span>
<a name="l00082"></a><a class="code" href="group___eeprom.html#g0f3449ca4a5f092e3cdf605799d14fc6">00082</a> <span class="keywordtype">int</span> <a class="code" href="group___eeprom.html#g0f3449ca4a5f092e3cdf605799d14fc6" title="Set the active state of the EEPROM subsystem.">Eeprom_SetActive</a>( <span class="keywordtype">int</span> state )
<a name="l00083"></a>00083 {
<a name="l00084"></a>00084   <span class="keywordflow">if</span> ( state )
<a name="l00085"></a>00085     <span class="keywordflow">return</span> Eeprom_Start();
<a name="l00086"></a>00086   <span class="keywordflow">else</span>
<a name="l00087"></a>00087     <span class="keywordflow">return</span> Eeprom_Stop();
<a name="l00088"></a>00088 }
<a name="l00089"></a>00089 <span class="comment"></span>
<a name="l00090"></a>00090 <span class="comment">/**</span>
<a name="l00091"></a>00091 <span class="comment">  Read the active state of the EEPROM.</span>
<a name="l00092"></a>00092 <span class="comment">  @return State - 1/non-zero (on) or 0 (off).</span>
<a name="l00093"></a>00093 <span class="comment">*/</span>
<a name="l00094"></a><a class="code" href="group___eeprom.html#g04eebd476f28804ef10866f692a78f4f">00094</a> <span class="keywordtype">int</span> <a class="code" href="group___eeprom.html#g04eebd476f28804ef10866f692a78f4f" title="Read the active state of the EEPROM.">Eeprom_GetActive</a>( )
<a name="l00095"></a>00095 {
<a name="l00096"></a>00096   <span class="keywordflow">return</span> Eeprom_users &gt; 0;
<a name="l00097"></a>00097 }
<a name="l00098"></a>00098 <span class="comment"></span>
<a name="l00099"></a>00099 <span class="comment">/** </span>
<a name="l00100"></a>00100 <span class="comment">  Write data to the EEPROM.</span>
<a name="l00101"></a>00101 <span class="comment">  @param address An integer specifying the address.</span>
<a name="l00102"></a>00102 <span class="comment">  @param buffer A pointer to the buffer to write from.</span>
<a name="l00103"></a>00103 <span class="comment">  @param count An integer specifying the number of bytes to write.</span>
<a name="l00104"></a>00104 <span class="comment">  @return status.</span>
<a name="l00105"></a>00105 <span class="comment">*/</span>
<a name="l00106"></a><a class="code" href="group___eeprom.html#g03d8b089bb0d04209e032ea233218d3a">00106</a> <span class="keywordtype">int</span> <a class="code" href="group___eeprom.html#g03d8b089bb0d04209e032ea233218d3a" title="Write data to the EEPROM.">Eeprom_Write</a>( <span class="keywordtype">int</span> address, uchar* buffer, <span class="keywordtype">int</span> count )
<a name="l00107"></a>00107 {
<a name="l00108"></a>00108   <span class="keywordflow">if</span> ( address &lt; 0 || address &gt;= EEPROM_SIZE )
<a name="l00109"></a>00109     <span class="keywordflow">return</span> <a class="code" href="group___error.html#g2be559398e755ed852ac38d0670d4692" title="Address is not valid.">CONTROLLER_ERROR_BAD_ADDRESS</a>;
<a name="l00110"></a>00110 
<a name="l00111"></a>00111   <span class="keywordflow">if</span> ( Eeprom_users == 0 )
<a name="l00112"></a>00112   {
<a name="l00113"></a>00113     <span class="keywordtype">int</span> status = Eeprom_Start();
<a name="l00114"></a>00114     <span class="keywordflow">if</span> ( status != <a class="code" href="group___error.html#gaa42bc036fbba18487ae9a15cd1f2f94" title="All&amp;#39;s well here.">CONTROLLER_OK</a> )
<a name="l00115"></a>00115       <span class="keywordflow">return</span> status;
<a name="l00116"></a>00116   }
<a name="l00117"></a>00117 
<a name="l00118"></a>00118   Spi_Lock();
<a name="l00119"></a>00119 
<a name="l00120"></a>00120   Eeprom_Ready( );
<a name="l00121"></a>00121 
<a name="l00122"></a>00122   <a class="code" href="eeprom_8c.html#3f8f6c2c544d8f2260569ce9b3e88e07" title="Eeprom_WriteEnable.">Eeprom_WriteEnable</a>();    
<a name="l00123"></a>00123 
<a name="l00124"></a>00124   uchar c[ count + 4 ];
<a name="l00125"></a>00125 
<a name="l00126"></a>00126   c[ 0 ] = EEPROM_INSTRUCTION_WRITE;
<a name="l00127"></a>00127   c[ 1 ] = (<span class="keywordtype">unsigned</span> char)( address &gt;&gt; 8 );
<a name="l00128"></a>00128   c[ 2 ] = (<span class="keywordtype">unsigned</span> char)( address &amp; 0xFF );
<a name="l00129"></a>00129   c[ 3 ] = 0;
<a name="l00130"></a>00130 
<a name="l00131"></a>00131   <span class="keywordtype">int</span> i;
<a name="l00132"></a>00132   <span class="keywordflow">for</span> ( i = 0; i &lt; count; i++ )
<a name="l00133"></a>00133   {
<a name="l00134"></a>00134     c[ i + 3 ] = buffer[ i ];
<a name="l00135"></a>00135   }
<a name="l00136"></a>00136   
<a name="l00137"></a>00137   <a class="code" href="group___spi.html#gcbeac2d91c1f365f6f96a022ae50f619" title="Read/Write a block of data via SPI.">Spi_ReadWriteBlock</a>( EEPROM_DEVICE, c, 3 + count );
<a name="l00138"></a>00138 
<a name="l00139"></a>00139   Spi_Unlock();
<a name="l00140"></a>00140 
<a name="l00141"></a>00141   <span class="keywordflow">return</span> <a class="code" href="group___error.html#gaa42bc036fbba18487ae9a15cd1f2f94" title="All&amp;#39;s well here.">CONTROLLER_OK</a>;
<a name="l00142"></a>00142 }
<a name="l00143"></a>00143 <span class="comment"></span>
<a name="l00144"></a>00144 <span class="comment">/** </span>
<a name="l00145"></a>00145 <span class="comment">  Read data from the EEPROM.</span>
<a name="l00146"></a>00146 <span class="comment">  @param address An integer specifying the address to read from.</span>
<a name="l00147"></a>00147 <span class="comment">  @param buffer A pointer to the buffer to read into.</span>
<a name="l00148"></a>00148 <span class="comment">  @param count An integer specifying the number of bytes to read.</span>
<a name="l00149"></a>00149 <span class="comment">  @return status.</span>
<a name="l00150"></a>00150 <span class="comment">*/</span>
<a name="l00151"></a><a class="code" href="group___eeprom.html#g95bd921a774026d4cc96b20d6a20d9dd">00151</a> <span class="keywordtype">int</span> <a class="code" href="group___eeprom.html#g95bd921a774026d4cc96b20d6a20d9dd" title="Read data from the EEPROM.">Eeprom_Read</a>( <span class="keywordtype">int</span> address, uchar* buffer, <span class="keywordtype">int</span> count )
<a name="l00152"></a>00152 {
<a name="l00153"></a>00153   <span class="keywordflow">if</span> ( address &lt; 0 || address &gt; EEPROM_SIZE )
<a name="l00154"></a>00154     <span class="keywordflow">return</span> <a class="code" href="group___error.html#g2be559398e755ed852ac38d0670d4692" title="Address is not valid.">CONTROLLER_ERROR_BAD_ADDRESS</a>;
<a name="l00155"></a>00155 
<a name="l00156"></a>00156   <span class="keywordflow">if</span> ( Eeprom_users == 0 )
<a name="l00157"></a>00157   {
<a name="l00158"></a>00158     <span class="keywordtype">int</span> status = Eeprom_Start();
<a name="l00159"></a>00159     <span class="keywordflow">if</span> ( status != <a class="code" href="group___error.html#gaa42bc036fbba18487ae9a15cd1f2f94" title="All&amp;#39;s well here.">CONTROLLER_OK</a> )
<a name="l00160"></a>00160       <span class="keywordflow">return</span> status;
<a name="l00161"></a>00161   }
<a name="l00162"></a>00162 
<a name="l00163"></a>00163   Spi_Lock();
<a name="l00164"></a>00164 
<a name="l00165"></a>00165   Eeprom_Ready( );
<a name="l00166"></a>00166 
<a name="l00167"></a>00167   <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c[ count + 4 ];
<a name="l00168"></a>00168 
<a name="l00169"></a>00169   c[ 0 ] = EEPROM_INSTRUCTION_READ;
<a name="l00170"></a>00170   c[ 1 ] = (<span class="keywordtype">unsigned</span> char)( address &gt;&gt; 8 );
<a name="l00171"></a>00171   c[ 2 ] = (<span class="keywordtype">unsigned</span> char)( address &amp; 0xFF );
<a name="l00172"></a>00172   c[ 3 ] = 0;
<a name="l00173"></a>00173   
<a name="l00174"></a>00174   <a class="code" href="group___spi.html#gcbeac2d91c1f365f6f96a022ae50f619" title="Read/Write a block of data via SPI.">Spi_ReadWriteBlock</a>( EEPROM_DEVICE, c, count + 3 );
<a name="l00175"></a>00175 
<a name="l00176"></a>00176   <span class="keywordtype">int</span> i;
<a name="l00177"></a>00177   <span class="keywordflow">for</span> ( i = 0; i &lt; count; i++ )
<a name="l00178"></a>00178   {
<a name="l00179"></a>00179     buffer[ i ] = c[ i + 3 ];
<a name="l00180"></a>00180   }
<a name="l00181"></a>00181 
<a name="l00182"></a>00182   Spi_Unlock();
<a name="l00183"></a>00183 
<a name="l00184"></a>00184   <span class="keywordflow">return</span> <a class="code" href="group___error.html#gaa42bc036fbba18487ae9a15cd1f2f94" title="All&amp;#39;s well here.">CONTROLLER_OK</a>;
<a name="l00185"></a>00185 }
<a name="l00186"></a>00186 <span class="comment"></span>
<a name="l00187"></a>00187 <span class="comment">/** </span>
<a name="l00188"></a>00188 <span class="comment">  Returns the last usable address in the EEPROM</span>
<a name="l00189"></a>00189 <span class="comment">  @return address</span>
<a name="l00190"></a>00190 <span class="comment">*/</span>
<a name="l00191"></a><a class="code" href="group___eeprom.html#g0d984a59a03896a61603790ba16dbbad">00191</a> <span class="keywordtype">int</span> <a class="code" href="group___eeprom.html#g0d984a59a03896a61603790ba16dbbad" title="Returns the last usable address in the EEPROM.">Eeprom_GetLastAddress</a>( )
<a name="l00192"></a>00192 {
<a name="l00193"></a>00193   <span class="keywordflow">return</span> EEPROM_SIZE - EEPROM_RESERVE_SIZE;
<a name="l00194"></a>00194 }
<a name="l00195"></a>00195 <span class="comment"></span>
<a name="l00196"></a>00196 <span class="comment">/** @}</span>
<a name="l00197"></a>00197 <span class="comment">*/</span>
<a name="l00198"></a>00198 
<a name="l00199"></a>00199 <span class="keywordtype">int</span> Eeprom_Start()
<a name="l00200"></a>00200 {
<a name="l00201"></a>00201   <span class="keywordtype">int</span> status;
<a name="l00202"></a>00202 
<a name="l00203"></a>00203   <span class="keywordflow">if</span> ( Eeprom_users++ == 0 )
<a name="l00204"></a>00204   {    
<a name="l00205"></a>00205     <span class="comment">// Attempt to open the SPI device</span>
<a name="l00206"></a>00206     status = Spi_Start( EEPROM_DEVICE );
<a name="l00207"></a>00207     <span class="keywordflow">if</span> ( status != <a class="code" href="group___error.html#gaa42bc036fbba18487ae9a15cd1f2f94" title="All&amp;#39;s well here.">CONTROLLER_OK</a> )
<a name="l00208"></a>00208     {
<a name="l00209"></a>00209       Eeprom_users--;
<a name="l00210"></a>00210       <span class="keywordflow">return</span> status;
<a name="l00211"></a>00211     }
<a name="l00212"></a>00212   
<a name="l00213"></a>00213     <span class="comment">// We're here means that we got the Spi open, now set it up</span>
<a name="l00214"></a>00214     status = <a class="code" href="group___spi.html#gcb528088437ee9b05515984b1033f748" title="Configure the SPI channel.">Spi_Configure</a>( EEPROM_DEVICE, 8, 4, 0, 1 );
<a name="l00215"></a>00215     <span class="keywordflow">if</span> ( status != <a class="code" href="group___error.html#gaa42bc036fbba18487ae9a15cd1f2f94" title="All&amp;#39;s well here.">CONTROLLER_OK</a> )
<a name="l00216"></a>00216     {
<a name="l00217"></a>00217       <span class="comment">// Undo all the setup.  Sigh.</span>
<a name="l00218"></a>00218       Eeprom_Stop();
<a name="l00219"></a>00219       <span class="keywordflow">return</span> status;
<a name="l00220"></a>00220     }
<a name="l00221"></a>00221   }
<a name="l00222"></a>00222   
<a name="l00223"></a>00223   <span class="keywordflow">return</span> <a class="code" href="group___error.html#gaa42bc036fbba18487ae9a15cd1f2f94" title="All&amp;#39;s well here.">CONTROLLER_OK</a>;
<a name="l00224"></a>00224 }
<a name="l00225"></a>00225 
<a name="l00226"></a>00226 <span class="keywordtype">int</span> Eeprom_Stop()
<a name="l00227"></a>00227 {
<a name="l00228"></a>00228   <span class="keywordflow">if</span> ( Eeprom_users &lt;= 0 )
<a name="l00229"></a>00229     <span class="keywordflow">return</span> <a class="code" href="group___error.html#g9ef65cc96e45d38307f661b86c330548" title="Lock attempt was unsuccessful.">CONTROLLER_ERROR_NOT_LOCKED</a>;
<a name="l00230"></a>00230 
<a name="l00231"></a>00231   <span class="keywordflow">if</span> ( --Eeprom_users == 0 )
<a name="l00232"></a>00232     Spi_Stop( EEPROM_DEVICE );
<a name="l00233"></a>00233 
<a name="l00234"></a>00234   <span class="keywordflow">return</span> <a class="code" href="group___error.html#gaa42bc036fbba18487ae9a15cd1f2f94" title="All&amp;#39;s well here.">CONTROLLER_OK</a>;
<a name="l00235"></a>00235 }
<a name="l00236"></a>00236 <span class="comment"></span>
<a name="l00237"></a>00237 <span class="comment">/** </span>
<a name="l00238"></a>00238 <span class="comment">  Eeprom_WriteEnable.</span>
<a name="l00239"></a>00239 <span class="comment">  Enable writing from the EEPROM on the Make Controller Board. </span>
<a name="l00240"></a>00240 <span class="comment">  This function should be called before making calls to Eeprom_Write().</span>
<a name="l00241"></a>00241 <span class="comment">  @param none.</span>
<a name="l00242"></a>00242 <span class="comment">  @return none.</span>
<a name="l00243"></a>00243 <span class="comment">*/</span>
<a name="l00244"></a><a class="code" href="eeprom_8c.html#3f8f6c2c544d8f2260569ce9b3e88e07">00244</a> <span class="keywordtype">void</span> <a class="code" href="eeprom_8c.html#3f8f6c2c544d8f2260569ce9b3e88e07" title="Eeprom_WriteEnable.">Eeprom_WriteEnable</a>()
<a name="l00245"></a>00245 {
<a name="l00246"></a>00246   uchar c;
<a name="l00247"></a>00247   c = EEPROM_INSTRUCTION_WREN;
<a name="l00248"></a>00248   
<a name="l00249"></a>00249   <a class="code" href="group___spi.html#gcbeac2d91c1f365f6f96a022ae50f619" title="Read/Write a block of data via SPI.">Spi_ReadWriteBlock</a>( EEPROM_DEVICE, &amp;c, 1 );
<a name="l00250"></a>00250 }
<a name="l00251"></a>00251 <span class="comment"></span>
<a name="l00252"></a>00252 <span class="comment">/** </span>
<a name="l00253"></a>00253 <span class="comment">  Disable writing from the EEPROM on the Make Controller Board.</span>
<a name="l00254"></a>00254 <span class="comment">  @param none.</span>
<a name="l00255"></a>00255 <span class="comment">  @return none.</span>
<a name="l00256"></a>00256 <span class="comment">*/</span>
<a name="l00257"></a><a class="code" href="eeprom_8c.html#d636853b4e254c0ca49fe4d6454b01ef">00257</a> <span class="keywordtype">void</span> <a class="code" href="eeprom_8c.html#d636853b4e254c0ca49fe4d6454b01ef" title="Disable writing from the EEPROM on the Make Controller Board.">Eeprom_WriteDisable</a>()
<a name="l00258"></a>00258 {
<a name="l00259"></a>00259   uchar c;
<a name="l00260"></a>00260   c = EEPROM_INSTRUCTION_WRDI;
<a name="l00261"></a>00261   
<a name="l00262"></a>00262   <a class="code" href="group___spi.html#gcbeac2d91c1f365f6f96a022ae50f619" title="Read/Write a block of data via SPI.">Spi_ReadWriteBlock</a>( EEPROM_DEVICE, &amp;c, 1 );
<a name="l00263"></a>00263 }
<a name="l00264"></a>00264 
<a name="l00265"></a>00265 <span class="keywordtype">void</span> Eeprom_Ready( <span class="keywordtype">void</span> )
<a name="l00266"></a>00266 {
<a name="l00267"></a>00267   <span class="keywordtype">int</span> status;
<a name="l00268"></a>00268   <span class="keywordflow">do</span>
<a name="l00269"></a>00269   {
<a name="l00270"></a>00270     <span class="keywordtype">unsigned</span> <span class="keywordtype">char</span> c[ 2 ];
<a name="l00271"></a>00271 
<a name="l00272"></a>00272     c[ 0 ] = EEPROM_INSTRUCTION_RDSR;
<a name="l00273"></a>00273     c[ 1 ] = 0;
<a name="l00274"></a>00274   
<a name="l00275"></a>00275     <a class="code" href="group___spi.html#gcbeac2d91c1f365f6f96a022ae50f619" title="Read/Write a block of data via SPI.">Spi_ReadWriteBlock</a>( EEPROM_DEVICE, c, 2 );
<a name="l00276"></a>00276 
<a name="l00277"></a>00277     status = c[ 1 ] != 0xFF;
<a name="l00278"></a>00278 
<a name="l00279"></a>00279   } <span class="keywordflow">while</span> ( !status );
<a name="l00280"></a>00280 }
<a name="l00281"></a>00281 
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  <p class="footer">The Make Controller Kit is an open source project maintained by <a href="http://www.makingthings.com">MakingThings</a>.<br />
    MakingThings code is released under the <a href="http://www.apache.org/licenses/LICENSE-2.0.html" target="_blank">Apache 2.0 license</a>.<br />
    Bug tracker, development wiki and status can be found at <a href="http://dev.makingthings.com">http://dev.makingthings.com</a>.<br />
		This document was last updated on 5 Dec 2007.
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